“So-and-so liked <insert a Facebook page> and suggested you like it too.”
Why are you sending me this message, Facebook? I haven’t authorized you to send me messages like this.
I double-checked my notification settings (which are at a minimum, as the screen shots below attest) and there’s no “opt-in-or-out” option for “when a friend likes a page.” There is an choice for “suggests a page to me” and my setting is “don’t send a notification.” Nevertheless, Facebook was sending me messages about pages, messages that appear to be auto-generated efforts by Facebook to push traffic.
To be sure you’ve “opted-out” of these notifications, manually click the “unsubscribe” link in the foot of one of these (annoying) emails.
Out of curiosity, I clicked the “page” link in the two most recent emails (today and yesterday). Both failed:


What does that say about Facebook’s quality control and application review?
Here are my notification settings. If you haven’t checked yours lately (Facebook -> Account -> Notifications), you might want to do so.